AXS Task
DMTAXS
VM/370 Spool File System
REX Task DMTCRE Create System
Service and
Line Driver
Tasks.
DMTMGX
Process Messages: Build the Final Message Element. Transmit File Message
DMTCMX
Process Commands: Execute DMTCMX
Commands Pass Command Elements to AXS and Line
Drivers for
Execution.
Line Driver Tasks A ... DMTREX Handle all REX
Requests Handle Program A. '--- Check Interrupts ..---- Handle Console I/O Terminate System
Service and Line
Driver Tasks l/--- N "I Supervisor Routines
Figure 14. program Organization for REX System Service Tasks RSCS Method of Operation and Program Organization BSC Line BSC Line
3-35
Figure 15. AXS Task (Mooule DMTAXS) CMDPROC Reorder Files by Recording
the TAGs queued
to a Given Line
Driver Purge Files
From RSCS Change the
Attributes
Associated with
an RSCS File Open and Close Input and Output Files Accept Files from VM/378 Spoel System REX Task I DMTMSG I Line Driver
Tasks AXSCYCLE ACCEPT: I DMTMGX I Files Spooled by Other Tasks I DMTREX I Order, Change
Purge Command Elements Requests to I DMTCRE I Open and Close VM/370 Spool Files. I DMTCMX I Supervisor Routines Prograa organization for the lIS Service Task
3-36 IBM VM/370: System Logic and Problem Deter.ination--Voluae 3 BSC Line BSC Line
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